Midwest Commutative Algebra Conference

Outside West Lafayette

Purdue University
West Lafayette, Indiana
August 3 - 7, 2015

Poster Session

During the conference, on August 5 from 2:50 to 5:00 pm, there will be a poster session, which will be held in the atrium in front of the lecture room (Lawson 1142).

The poster session is particularly targeted to peridoctoral students who are given the opportunity to advertise their research among the conference participants in a very informal, relaxed but conducive atmosphere. It is our hope that junior researchers will benefit from this experience by obtaining feedback and suggestions for future lines of investigation from more experienced researchers.

Directions/Suggestions: We will provide large poster displays where you can show your poster. It would be wiser though if you bring your 'favorite' scissor, push pins, glue, tape, markers from home as we cannot guarantee that we can provide you with all the supplies that you might want/need.
We also encourage you to read the material posted at the following links on how to plan and prepare a poster presentation:
  1. http://www.ce.umn.edu/~smith/supplements/poster/guide.htm
  2. http://www.siam.org/meetings/guidelines/poster.php
  3. http://www.siam.org/meetings/guidelines/presenters.php

Poster Titles/Presenters

  1. Tensor product surfaces and linear syzygies
    Eliana M. Duarte, University of Illinois at Urbana-Champaign
    Abstract: A tensor product surface is the image of a map φ : P1 P1P3. Such surfaces arise in geometric modeling, and it is often useful to find the implicit equation for the surface. In this poster we explain how the implicit equation can be obtained from the syzygies of the defining polynomials of the map via an approximation complex. In particular the existence of a linear syzygy allows for a straightforward description of the implicit equation of the image from which we can describe part of the codimension 1 singular locus. This is joint work with Hal Schenck.

  2. Zero-Divisors-Cup-Length of Orlik-Solomon Algebras
    Nathan Fieldsteel, University of Illinois at Urbana-Champaign
    Abstract: For an algebra over a field, the zero-divisors-cup-length is an integer invariant which generalizes the ordinary cup length and contains information about the obstructions to finding continuous motion planning algorithms for spaces with cohomology ring isomorphic to that algebra. We are interested in computing the zero-divisors-cup-length for Orlik-Solomon algebras, which are the cohomology rings of complements of complex hyperplane arrangements.

  3. G-Theory of hypersurface singularities
    Zachary Flores, Colorado State University
    Abstract: We discuss the recent advancements in computing lower G-groups for the category of finitely generated modules over hypersurface singularities of finite type. We also discuss computations and further directions in the structure of the G-theory of these rings.

  4. Blowing up finitely supported complete ideals in a regular local ring
    Youngsu Kim, University of California at Riverside
    Abstract: We investigate the singularities of the blowup of a finitely supported ideal in a regular local ring. We show that if the normalized blowup of a finitely supported ideal is factorial, then it is non-singular. This is a generalization of the theorem of Lipman and Huneke-Sally. This is a joint work with William Heinzer and Matthew Toeniskoetter.

  5. On minimal free resolutions of the associated graded rings of Gorenstein monomial curves
    Pinar Mete, Balikesir University
    Abstract: Our main goal is to give the minimal free resolution of the associated graded ring grm(A), where A = k[[x1, . . . , xn]]/I(C), of Gorenstein monomial curve C in embedding dimension four under some restrictions on the generators in the defining ideal I(C) and also to study to characterize the Hilbert function of the local ring A.

  6. Rees algebra and almost linearly presented ideals
    Vivek Mukundan, Purdue University
    Abstract: We present the defining ideal of Rees algebra of grade 2 perfect ideals whose presentation matrix is almost linear. We also introduce the notion of iterated Jacobian duals along with its application in the case of ideals whose second analytic deviation is one. Joint work with Jacob A Boswell.

  7. When does the Frobenius splitting number function have a second coefficient?
    Thomas Polstra, University of Missouri
    Abstract: Suppose that (R,m,k) is a local normal F-finite domain of prime characteristic p > 0, with perfect residue field k, dimension d, and suppose that I is an m-primary ideal. It has been shown by Huneke, McDermott, and Monsky that there is a coefficient bR such that for λ(R/I[q])=eHK(I)qd+bqd-1+O(qd-2) where q=pe is a power of the characteristic and eHK(I) is the Hilbert-Kunz multiplicity of I. Given such a ring it is now natural to ask when does the Frobenius splitting number function have a second coefficient, i.e., when does there exist a tR such that aq = sqd+tqd-1+O(qd-2) where aq is the Frobenius splitting number function of R and s is the F-signature of R. We develop some conditions which imply the existence of a second coefficient of the Frobenius splitting number function and ask whether these conditions can be met outside cases where Huneke, McDermott, and Monsky's results already imply that the Frobenius splitting number function has a second coefficient.

  8. Closure operations that induce Big CM modules and algebras
    Rebecca R.G., University of Michigan
    Abstract: We review axioms for Dietz closures, which imply the existence of big CM modules, and give an additional axiom sufficient for big CM algebras. We show under mild conditions on R that all Dietz closures are trivial if and only if R is regular.

  9. Deviations of graded algebras
    Alessio Sammartano, Purdue University
    Abstract: The deviations of a graded algebra are a sequence of numbers that determine its Poincaré series and arise as the number of generators of certain DG algebra resolutions. While these invariants encode important homological information, they are considerably hard to determine explicitly even in simple examples. We study extremal deviations among those of algebras with a fixed Hilbert series and the asymptotic growth of deviations for Golod rings and for algebras presented by certain edge ideals. This is joint work with Adam Boocher, Alessio D'Alì, Eloísa Grifo, and Jonathan Montaño.

  10. Pullback diagrams and Kronecker function rings
    Simplice Tchamna-Kouna, Georgia College
    Abstract: We present the notion of Kronecker function subring of a ring extension RS. For each ring extension RS and a star operation * on RS, we study the properties of the Kronecker subring Kr(R,*, S) of S(X) defined by Knebusch and Kaiser. We also study the behavior of the ring Kr(R,*, S) in pullback diagrams.

  11. On the top local cohomology modules
    Tugba Yildirim, Istanbul Technical University
    Abstract: Throughout, let R denote a commutative Noetherian ring, I an ideal of R and M an R-module. Let cd(I,M) denote the cohomological dimension of M with respect to I. In a joint work with Vahap Erdoǧdu, for an R-module M with cd(I,M)=c, we show the existence of a descending chain of ideals I = IcIc-1 ⊋ … ⊋ I0 of R such that for each 0 ≤ ic-1, cd(Ii,M)=i and that the top local cohomology module HiIi(M) is not Artinian. We then give sufficient conditions for an arbitrary integer t to be a lower bound for cd(I,M), and use this to conclude that in non-catenary Noetherian local integral domains, there exist prime ideals that are not set theoretic complete intersection. For an R-module M of dimension n such that Hnm(M) ≠ 0 (where R is local with unique maximal ideal m), we also resolve the Artinianness and non-Artinianness of top local cohomology modules, HIcd(I,M)(M), in all cases except in the case cd(I,M) = n-1 and dim(R/I+Ann(M)) >1 for which we have some sorter results under certain conditions.